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266 lines
9.2 KiB
266 lines
9.2 KiB
4 years ago
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#!/usr/bin/env python3
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'''Add syntax highlighting to Python source code'''
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__author__ = 'Raymond Hettinger'
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import builtins
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import functools
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import html as html_module
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import keyword
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import re
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import tokenize
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#### Analyze Python Source #################################
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def is_builtin(s):
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'Return True if s is the name of a builtin'
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return hasattr(builtins, s)
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def combine_range(lines, start, end):
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'Join content from a range of lines between start and end'
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(srow, scol), (erow, ecol) = start, end
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if srow == erow:
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return lines[srow-1][scol:ecol], end
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rows = [lines[srow-1][scol:]] + lines[srow: erow-1] + [lines[erow-1][:ecol]]
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return ''.join(rows), end
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def analyze_python(source):
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'''Generate and classify chunks of Python for syntax highlighting.
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Yields tuples in the form: (category, categorized_text).
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'''
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lines = source.splitlines(True)
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lines.append('')
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readline = functools.partial(next, iter(lines), '')
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kind = tok_str = ''
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tok_type = tokenize.COMMENT
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written = (1, 0)
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for tok in tokenize.generate_tokens(readline):
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prev_tok_type, prev_tok_str = tok_type, tok_str
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tok_type, tok_str, (srow, scol), (erow, ecol), logical_lineno = tok
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kind = ''
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if tok_type == tokenize.COMMENT:
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kind = 'comment'
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elif tok_type == tokenize.OP and tok_str[:1] not in '{}[](),.:;@':
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kind = 'operator'
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elif tok_type == tokenize.STRING:
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kind = 'string'
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if prev_tok_type == tokenize.INDENT or scol==0:
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kind = 'docstring'
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elif tok_type == tokenize.NAME:
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if tok_str in ('def', 'class', 'import', 'from'):
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kind = 'definition'
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elif prev_tok_str in ('def', 'class'):
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kind = 'defname'
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elif keyword.iskeyword(tok_str):
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kind = 'keyword'
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elif is_builtin(tok_str) and prev_tok_str != '.':
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kind = 'builtin'
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if kind:
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text, written = combine_range(lines, written, (srow, scol))
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yield '', text
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text, written = tok_str, (erow, ecol)
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yield kind, text
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line_upto_token, written = combine_range(lines, written, (erow, ecol))
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yield '', line_upto_token
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#### Raw Output ###########################################
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def raw_highlight(classified_text):
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'Straight text display of text classifications'
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result = []
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for kind, text in classified_text:
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result.append('%15s: %r\n' % (kind or 'plain', text))
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return ''.join(result)
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#### ANSI Output ###########################################
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default_ansi = {
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'comment': ('\033[0;31m', '\033[0m'),
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'string': ('\033[0;32m', '\033[0m'),
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'docstring': ('\033[0;32m', '\033[0m'),
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'keyword': ('\033[0;33m', '\033[0m'),
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'builtin': ('\033[0;35m', '\033[0m'),
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'definition': ('\033[0;33m', '\033[0m'),
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'defname': ('\033[0;34m', '\033[0m'),
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'operator': ('\033[0;33m', '\033[0m'),
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}
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def ansi_highlight(classified_text, colors=default_ansi):
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'Add syntax highlighting to source code using ANSI escape sequences'
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# http://en.wikipedia.org/wiki/ANSI_escape_code
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result = []
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for kind, text in classified_text:
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opener, closer = colors.get(kind, ('', ''))
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result += [opener, text, closer]
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return ''.join(result)
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#### HTML Output ###########################################
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def html_highlight(classified_text,opener='<pre class="python">\n', closer='</pre>\n'):
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'Convert classified text to an HTML fragment'
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result = [opener]
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for kind, text in classified_text:
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if kind:
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result.append('<span class="%s">' % kind)
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result.append(html_module.escape(text))
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if kind:
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result.append('</span>')
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result.append(closer)
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return ''.join(result)
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default_css = {
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'.comment': '{color: crimson;}',
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'.string': '{color: forestgreen;}',
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'.docstring': '{color: forestgreen; font-style:italic;}',
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'.keyword': '{color: darkorange;}',
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'.builtin': '{color: purple;}',
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'.definition': '{color: darkorange; font-weight:bold;}',
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'.defname': '{color: blue;}',
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'.operator': '{color: brown;}',
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}
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default_html = '''\
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
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<title> {title} </title>
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<style type="text/css">
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{css}
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</style>
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</head>
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<body>
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{body}
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</body>
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</html>
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'''
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def build_html_page(classified_text, title='python',
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css=default_css, html=default_html):
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'Create a complete HTML page with colorized source code'
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css_str = '\n'.join(['%s %s' % item for item in css.items()])
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result = html_highlight(classified_text)
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title = html_module.escape(title)
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return html.format(title=title, css=css_str, body=result)
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#### LaTeX Output ##########################################
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default_latex_commands = {
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'comment': r'{\color{red}#1}',
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'string': r'{\color{ForestGreen}#1}',
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'docstring': r'{\emph{\color{ForestGreen}#1}}',
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'keyword': r'{\color{orange}#1}',
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'builtin': r'{\color{purple}#1}',
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'definition': r'{\color{orange}#1}',
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'defname': r'{\color{blue}#1}',
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'operator': r'{\color{brown}#1}',
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}
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default_latex_document = r'''
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\documentclass{article}
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\usepackage{alltt}
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\usepackage{upquote}
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\usepackage{color}
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\usepackage[usenames,dvipsnames]{xcolor}
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\usepackage[cm]{fullpage}
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%(macros)s
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\begin{document}
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\center{\LARGE{%(title)s}}
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\begin{alltt}
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%(body)s
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\end{alltt}
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\end{document}
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'''
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def alltt_escape(s):
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'Replace backslash and braces with their escaped equivalents'
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xlat = {'{': r'\{', '}': r'\}', '\\': r'\textbackslash{}'}
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return re.sub(r'[\\{}]', lambda mo: xlat[mo.group()], s)
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def latex_highlight(classified_text, title = 'python',
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commands = default_latex_commands,
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document = default_latex_document):
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'Create a complete LaTeX document with colorized source code'
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macros = '\n'.join(r'\newcommand{\py%s}[1]{%s}' % c for c in commands.items())
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result = []
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for kind, text in classified_text:
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if kind:
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result.append(r'\py%s{' % kind)
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result.append(alltt_escape(text))
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if kind:
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result.append('}')
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return default_latex_document % dict(title=title, macros=macros, body=''.join(result))
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if __name__ == '__main__':
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import argparse
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import os.path
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import sys
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import textwrap
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import webbrowser
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parser = argparse.ArgumentParser(
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description = 'Add syntax highlighting to Python source code',
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formatter_class=argparse.RawDescriptionHelpFormatter,
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epilog = textwrap.dedent('''
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examples:
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# Show syntax highlighted code in the terminal window
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$ ./highlight.py myfile.py
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# Colorize myfile.py and display in a browser
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$ ./highlight.py -b myfile.py
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# Create an HTML section to embed in an existing webpage
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./highlight.py -s myfile.py
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# Create a complete HTML file
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$ ./highlight.py -c myfile.py > myfile.html
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# Create a PDF using LaTeX
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$ ./highlight.py -l myfile.py | pdflatex
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'''))
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parser.add_argument('sourcefile', metavar = 'SOURCEFILE',
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help = 'file containing Python sourcecode')
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parser.add_argument('-b', '--browser', action = 'store_true',
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help = 'launch a browser to show results')
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parser.add_argument('-c', '--complete', action = 'store_true',
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help = 'build a complete html webpage')
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parser.add_argument('-l', '--latex', action = 'store_true',
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help = 'build a LaTeX document')
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parser.add_argument('-r', '--raw', action = 'store_true',
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help = 'raw parse of categorized text')
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parser.add_argument('-s', '--section', action = 'store_true',
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help = 'show an HTML section rather than a complete webpage')
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args = parser.parse_args()
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if args.section and (args.browser or args.complete):
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parser.error('The -s/--section option is incompatible with '
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'the -b/--browser or -c/--complete options')
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sourcefile = args.sourcefile
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with open(sourcefile) as f:
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source = f.read()
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classified_text = analyze_python(source)
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if args.raw:
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encoded = raw_highlight(classified_text)
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elif args.complete or args.browser:
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encoded = build_html_page(classified_text, title=sourcefile)
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elif args.section:
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encoded = html_highlight(classified_text)
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elif args.latex:
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encoded = latex_highlight(classified_text, title=sourcefile)
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else:
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encoded = ansi_highlight(classified_text)
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if args.browser:
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htmlfile = os.path.splitext(os.path.basename(sourcefile))[0] + '.html'
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with open(htmlfile, 'w') as f:
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f.write(encoded)
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webbrowser.open('file://' + os.path.abspath(htmlfile))
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else:
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sys.stdout.write(encoded)
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